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Employee Benefit Plans (Components of Net Pension Expense) (Details) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of Net Pension Expense:
Service cost	$ 27.8	$ 26.7	$ 19.0
Interest cost	10.7	11.7	12.3
Expected return on plan assets	(21.7)	(21.0)	(20.0)
Recognized net actuarial loss	4.5	4.8	5.0
Net Pension Expense	$ 21.3	$ 22.2	$ 16.3
Assumptions Used to Determine End-of-Year Benefit Obligation:
Discount rate	3.00%	2.70%	3.40%
Rate of compensation increase	4.00%	4.00%	5.00%
Cash balance interest crediting rate	4.00%	4.00%	4.00%
Assumptions Used to Determine Net Pension Expense:
Discount rate	2.70%	3.40%	4.40%
Rate of compensation increase	4.00%	5.00%	5.00%
Expected return on plan assets	5.75%	6.00%	6.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate	4.00%	4.00%	4.00%

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